/usr/lib/ocaml/ocamlgraph/META is in libocamlgraph-ocaml-dev 1.8.6-1+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | version = "1.8.6"
description = "Generic Graph Library"
requires=""
archive(byte) = "graph.cma"
archive(native) = "graph.cmxa"
|